April 2, 2008
Symantec AutoFix Support Tool ActiveX Control Vulnerabilities

Revision History
April 8, 2008 Added CVE information
May 30, 2008 Updated link to the AutoFix tool


Remote AccessYes
Local AccessYes
Authentication RequiredNo
Exploit publicly availableNo

Two vulnerabilities reported in an ActiveX control used by the Symantec AutoFix Tool could potentially allow arbitrary code execution in the context of the userís browser. Successful exploitation requires user interaction.

Affected Products
Norton 360Windows1.0Update available
Norton AntiVirus Windows2006 - 2008Update available
Norton Internet Security Windows2006 - 2008Update available
Norton System Works Windows2006 - 2008Update available

The affected ActiveX control is shipped only with the consumer products noted above. The control may also have been installed during an online chat session with a member of Symantecís Consumer Technical Support team. See How to Obtain an Updated AutoFix Tool, below, for information on the update.

Unaffected Products
Norton 360Windows2.0
Norton AntiBotWindowsAll
Norton AntiVirus for MacintoshMacintoshAll
Norton AntiVirus Dual Protection for MacintoshMacintoshAll
Norton ConfidentialWindows, MacintoshAll
Norton GhostWindowsAll
Norton Internet Security MacintoshAll
Norton Partition Magic MacintoshAll
Norton Personal Firewall MacintoshAll
Norton Smartphone Security WindowsAll

Note:The affected ActiveX control is not used to troubleshoot problems with Symantec enterprise software, such as Symantec Endpoint Protection. Enterprise products do not include or use the affected ActiveX control.

IDefense notified Symantec of two vulnerabilities in an ActiveX control (SYMADATA.DLL) used to troubleshoot Symantec consumer products.

The first vulnerability, reported by Peter Vreugdenhill, is a stack based buffer overflow which could allow a successful attacker to run code of their choice in the context of the userís browser. The user must be enticed to visit a malicious website masquerading as a trusted Symantec site before an attack can be launched.

The second vulnerability occurs due to a design error in the process used to look for and launch the AutoFix Tool. If successfully exploited, an attacker could load and execute code of their choice from a remote share. However, this can occur only if the target system (userís system) is configured to allow access to remote shares via WebDav or SMB.

Symantec Response
Symantec engineers have developed and released updates to address both of these vulnerabilities, as described under How to Obtain the Update.

The affected ActiveX control is digitally signed and site locked so it can only be scripted from a trusted domain. To successfully exploit either vulnerability, an attacker would need to be able to masquerade as the trusted Symantec website, such as through a Cross Site Scripting attack or DNS poisoning. The user must also be enticed to visit the malicious website from which the attack would be launched. This type of attack is often achieved by sending email or instant message containing a link to the malicious site, and persuading the recipient to click on the link.

The overall severity of these vulnerabilities is considered to be low because of the indirect nature of the attack vector, and the reliance on user interaction to accomplish a successful exploit.

Symantec is not aware of any customers impacted by this issue, or of any attempts to exploit the issue.

Symantec has released IPS signatures for Norton firewall products, to detect and block attempts to exploit the buffer overflow (BID 28507). In addition, Symantec Security Response has released a Bloodhound detection for all Symantec antivirus programs, to detect and block attempts to exploit the launch process design error. These signatures are available by running LiveUpdate.

How to Obtain IPS and Virus Definition Updates
Symantec Norton product users who regularly launch and run LiveUpdate should already have received the IPS signatures and virus definitions. However, to ensure all available updates have been applied, users can manually launch and run LiveUpdate in Interactive mode as follows:

How to Obtain an Updated AutoFix Tool
An updated (non-vulnerable) version of the AutoFix tool will be automatically installed if customers participate in an online Chat session with Symantec Technical Support.
Customers can also download and install an updated AutoFix Tool here:

Best Practices
As a part of normal best practices, users should keep vendor-supplied patches for all software and operating systems up-to-date. Symantec recommends any affected customers update their product immediately to protect against potential attempts to exploit these vulnerabilities.

Additional best practices include:

Symantec would like to thank Peter Vreugdenhill and an anonymous finder, working with the IDefense VCP ( for reporting these issues, and coordinating with us on the response.

These issues are candidates for inclusion in the Common Vulnerabilities and Exposures (CVE) list (, which standardizes names for security problems. CVE has assigned CVE-2008-0312 to the buffer overflow, and CVE-2008-0313 to the launch process design error.

SecurityFocus,, has assigned BID 28507 to the buffer overflow reported by Peter Vreugdenhill, and BID28509 to the launch process design error reported by an anonymous finder.

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